Piezoelectric or pyroelectric composite production

摘要

Production of a piezoelectric or pyroelectric 0-3-composite with high filling content involves (a) emulsifying an aqueous solution, containing the desired ratio of ceramic cations, in an organic solvent under conditions which control the droplet size of the emulsified discontinuous aqueous phase; (b) adding a precipitant to precipitate the cations in the aqueous phase; (c) drying to remove the solvent and leave solid particles which are then calcined to ceramic powder in an oxygen-containing atmosphere; (d) mixing and homogenising the ceramic powder with an unset or partially set plastic material; and (e) moulding and optionally setting the plastic material. Preferably, the plastic material is an oligomeric elastomer. Also claimed is a pyroelectric or piezoelectric 0-3-composite produced by the above method and having a ceramic filling content of 70-90 vol.%.